Some preliminary results:It appears that the Zodiac Leatherneck award was/is presented to a USNA Midshipmen commissioned in the Marine Corps achieving the highest cumulative score during the Leatherneck course at TBS. The Marine Corps Association & Foundation sponsored the Leatherneck Award. I believe it was also awarded to the top recruit from his/her platoon with the highest grades and the best physical fitness score. In the mid to late 1950s the award took the form of the Zodiac Hermetic watch. From what I can tell so far, and I am still waiting for some ex-marines to confirm, the watches were only awarded over a small time period. More to come as I keep digging. Might be a lot scarcer than I first thought.